# HS code 8540.91: Parts, of cathode-ray tubes > HS code 8540.91 covers parts, of cathode-ray tubes. It sits in heading 85.40 (thermionic, cold cathode or photo-cathode valves and tubes (for example, vacuum or vapour or gas filled valves and tubes, mercury arc rectifying valves and tubes, cathode-ray tubes, television camera tubes)) in chapter 85 (electrical machinery and equipment and parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles). Other goods of heading 85.40 are classified under 8540.11 (cathode ray television picture tubes, including video monitor cathode ray tubes, colour), 8540.12 (cathode ray television picture tubes, including video monitor cathode ray tubes, monochrome), 8540.20 (television camera tubes; image converters and intensifiers; other photo-cathode tubes), 8540.40 (data/graphic display tubes, monochrome; data/graphic display tubes, colour, with a phosphor dot screen pitch smaller than 0,4 mm) or 6 others. National tariff lines under 8540.91 are live on border.bot for the United States (3 lines, also used by 1 other country). Source: https://border.bot/hs-codes/854091 Last updated: 11 October 2026 [HS codes](https://border.bot/hs-codes) / [Chapter 85](https://border.bot/hs-codes/85) / [85.40](https://border.bot/hs-codes/8540) / [8540.91](https://border.bot/hs-codes/854091) ## Key facts - HS code: 8540.91 - Covers: Parts, of cathode-ray tubes - Heading: [85.40: Thermionic, cold cathode or photo-cathode valves and tubes (for example, vacuum or vapour or gas filled valves and tubes, mercury arc rectifying valves and tubes, cathode-ray tubes, television camera tubes)](https://border.bot/hs-codes/8540) - Chapter: [85: Electrical machinery and equipment and parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles](https://border.bot/hs-codes/85) - Edition: HS2022 - Duty in the United States: [See its 3 lines](https://border.bot/countries/united-states/hs-codes/854091) ## What this code covers HS code 8540.91 covers parts, of cathode-ray tubes. The legal text of the subheading is “Parts: Of cathode-ray tubes”, read under “Parts”, in HS2022. ## What it doesn’t cover Other goods of heading 85.40 are classified under 8540.11 (cathode ray television picture tubes, including video monitor cathode ray tubes, colour), 8540.12 (cathode ray television picture tubes, including video monitor cathode ray tubes, monochrome), 8540.20 (television camera tubes; image converters and intensifiers; other photo-cathode tubes), 8540.40 (data/graphic display tubes, monochrome; data/graphic display tubes, colour, with a phosphor dot screen pitch smaller than 0,4 mm) or 6 others. - [8540.11](https://border.bot/hs-codes/854011) Cathode ray television picture tubes, including video monitor cathode ray tubes: Colour - [8540.12](https://border.bot/hs-codes/854012) Cathode ray television picture tubes, including video monitor cathode ray tubes: Monochrome - [8540.20](https://border.bot/hs-codes/854020) Television camera tubes; image converters and intensifiers; other photo-cathode tubes - [8540.40](https://border.bot/hs-codes/854040) Data/graphic display tubes, monochrome; data/graphic display tubes, colour, with a phosphor dot screen pitch smaller than 0,4 mm - [8540.60](https://border.bot/hs-codes/854060) Other cathode-ray tubes - [8540.71](https://border.bot/hs-codes/854071) Microwave tubes (for example, magnetrons, klystrons, travelling-wave tubes, carcinotrons), excluding grid-controlled tubes: Magnetrons - [8540.79](https://border.bot/hs-codes/854079) Microwave tubes (for example, magnetrons, klystrons, travelling-wave tubes, carcinotrons), excluding grid-controlled tubes: Other - [8540.81](https://border.bot/hs-codes/854081) Other valves and tubes: Receiver or amplifier valves and tubes - [8540.89](https://border.bot/hs-codes/854089) Other valves and tubes: Other - [8540.99](https://border.bot/hs-codes/854099) Parts: Other ## How it is structured 8540.91 is a six-digit subheading. Its first two digits, 85, are the chapter; the first four, 8540, are heading 85.40; the last two, 91, identify the subheading within the heading. Countries add their own digits after these six for their national tariff lines. - Chapter 85: Electrical machinery and equipment and parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles - Heading 85.40: Thermionic, cold cathode or photo-cathode valves and tubes (for example, vacuum or vapour or gas filled valves and tubes, mercury arc rectifying valves and tubes, cathode-ray tubes, television camera tubes) - Within the heading: Parts - Subheading 8540.91: Of cathode-ray tubes ## In other countries National tariff lines under 8540.91 are live on border.bot for the United States (3 lines, also used by 1 other country). - [United States](https://border.bot/countries/united-states/hs-codes/854091): 3 lines, used by 1 other country - Previous subheading: [8540.89](https://border.bot/hs-codes/854089) Other valves and tubes: Other - Next subheading: [8540.99](https://border.bot/hs-codes/854099) Parts: Other ## Frequently asked questions ### What does HS code 8540.91 cover? HS code 8540.91 covers parts, of cathode-ray tubes. ### Which heading and chapter is HS code 8540.91 in? HS code 8540.91 is in heading 85.40 (thermionic, cold cathode or photo-cathode valves and tubes (for example, vacuum or vapour or gas filled valves and tubes, mercury arc rectifying valves and tubes, cathode-ray tubes, television camera tubes)) in chapter 85 (electrical machinery and equipment and parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles). ### Where are goods of heading 85.40 classified when 8540.91 doesn’t fit? Other goods of heading 85.40 are classified under 8540.11 (cathode ray television picture tubes, including video monitor cathode ray tubes, colour), 8540.12 (cathode ray television picture tubes, including video monitor cathode ray tubes, monochrome), 8540.20 (television camera tubes; image converters and intensifiers; other photo-cathode tubes), 8540.40 (data/graphic display tubes, monochrome; data/graphic display tubes, colour, with a phosphor dot screen pitch smaller than 0,4 mm) or 6 others. ### Which countries’ tariffs list national lines under HS code 8540.91? National tariff lines under 8540.91 are live on border.bot for the United States (3 lines, also used by 1 other country). ## Sources and updates The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026. This page was last updated on 11 October 2026. Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling. Machine-readable: https://border.bot/hs-codes/854091.json